51305065056 has 108 divisors (see below), whose sum is σ = 169719034212. Its totient is φ = 14658585984.

The previous prime is 51305065043. The next prime is 51305065057. The reversal of 51305065056 is 65056050315.

51305065056 is a `hidden beast` number, since 51 + 3 + 0 + 506 + 50 + 56 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 51305065056.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51305065057) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1803670 + ... + 1831893.

It is an arithmetic number, because the mean of its divisors is an integer number (1571472539).

Almost surely, 2^51305065056 is an apocalyptic number.

51305065056 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51305065056 is an abundant number, since it is smaller than the sum of its proper divisors (118413969156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51305065056 is a wasteful number, since it uses less digits than its factorization.

51305065056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3635593 (or 3635575 counting only the distinct ones).

The product of its (nonzero) digits is 67500, while the sum is 36.

The spelling of 51305065056 in words is "fifty-one billion, three hundred five million, sixty-five thousand, fifty-six".